I don't think movies are necessarily better, or worse, than those of yesteryear. I can think of fantastic films that are decades old, and I can also think of films from the same eras that aren't very good at all. The absolute same can be said of todays movies too.
I think the biggest difference nowadays, is the hype - I get the impression that films are getting more and more hyped before a release (due to the fact that the internet makes spread of trailers, interviews etc etc much easier). Looking at some trailers from the 70s for instance, I get the feeling that they were more there to inform us that a film is being made, whereas now they seem to be there to try and hype it as much as possible (as well as let us know that the film is in production XD).
An example of this (imo) is Star Wars the Force Awakens. That film had absolute massive hype, and no small part of that is it being a new Star Wars film. I know many people who went to see it and were like: 'It's on par with Empire Strikes Back'. Now, I enjoyed it and think that it is a good film, but after taking a step back after seeing it and looking at it more objectively, it doesn't strike me as being anything special (Star Wars Episode 7: A New Hope XD). The original trilogy will always go down (in my book) as timeless classics, Ep 7...not so much, and I suspect people were influenced by that hype to the point where it skewered their perspective of it (or I might just be being grumpy lol).
But, one film that I found absolutely fantastic was Interstellar, and (over here at least), it didn't seem to get much hype at all (besides it being a Nolan film) - I didn't even know what it was about (besides that it has some space in it) when I first went to see it.